Question

Figure represents a square carrying charges +q, +q, -q, -q at its four corners as shown. Then the potential will be zero at points

Options

• A, B, C, P and Q

• A, B and C

• A, P, C and Q

• P, B and Q

Answer 1

A, B and C

Explanation:

Potential at A = V_E + V_H

= `"kq"/"r"-"kq"/"r"` = 0

Potential at B = V_E + V_F + V_G + V_H

`"kq"/"r"_1+"kq"/"r"_1 - "kq"/"r"_1-"kq"/"r"_1` = 0

Potential at C = V_F + V_G

`"kq"/"r"-"kq"/"r"` = 0

Potential at P = V_E + V_F

`"kq"/"r"+"kq"/"r" = (2"kq")/"r"`

Potential at Q = V_H + V_G

`"kq"/"r"-"kq"/"r" = -(2"kq")/"r"`

So potential will be zero at point A, B and C.

Therefore, the correct answer is A, B and C.